Hesitant Pick and Check Engine Light

[talero]

Hello. I need help. My 2003 Alero is hesitant to pick up. When I go up a hill it won't go over 30mphs and there is this hissing noise coming from the engine. We can smell smoke in the car when I start it. My gas is decreasing much more than usual. I had a mechanic friend recommend to change the gasskit (spelling). My check engine light is on also. My check engine light was on before this and a local repair shop said that it was the Sensor 2 and not that important.

Please help with advice and around the price I should pay for the service. People cheat you, male or female.

Thank you.

[BNaylor]

Welcome to AF.

It would help to post which engine you have. 2.2L Ecotec or 3400 V6?

Also post the diagnostic trouble code(s) (DTC)?

It could be a clogged CAT converter.